Minor: Remove an obsolete warning in Android subplugin

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/AndroidSubplugin.kt

@@ -212,8 +212,6 @@ class AndroidSubplugin : KotlinGradleSubplugin<KotlinCompile> {
             }
         }
 
-        project.logger.warn("Blah: " + allResDirectories)
-
         return wrapPluginOptions(pluginOptions, "configuration")
     }